Automatic system for handling batteries

• US 5,587,924 A
• Filed: 03/31/1995
• Issued: 12/24/1996
• Est. Priority Date: 03/31/1995
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Rossi, Markku J.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): SHAH, KAMINI S
• Application Number:
  US08/414,760
• Time in Patent Office: 634 Days
• Field of Search: 364/496, 364/403, 364/550, 364/492 C, 340/636, 320/2
• US Class Current: 702/63
• CPC Class Codes: H02J 7/00038 using passive battery identification means, e.g. resistors or capacitors identification by mechanical connections H02J7/0045
• CPC Class Codes: H02J 7/00047 with provisions for charging different types of batteries

Abstract

The present invention is related to a battery type determination circuit having a notch filter circuit which notches a frequency noise spectrum to indicate a battery type installed in a battery pack. More specifically, the preferred embodiment of the present invention can determine a variety of battery characteristics based on the notched frequency and look-up information stored in a memory chip.

Claims

1. A system for determining a battery'"'"'s energy capacity while the battery is in use in an electronic device, comprising:

a battery pack;

a first set of capacitors mounted in said battery pack comprising at least one capacitor;

a first set of resistors mounting in said battery pack comprising at least one resistor;

an op-amp circuit adapted to connect to said first set of capacitors and said first set of resistors so that a notch filter circuit results;

a noise generator connected to said notch filter;

an analog-to-digital converter connected to said notch filter for receiving a filtered signal and for producing a digital signal that corresponds to said filtered signal;

a look-up table; and

a processor circuit connected to said look-up table and to said analog to digital converter for determining the energy capacity of said battery.

2. The system of claim 1, wherein said op-amp circuit is positioned in said battery pack.

3. The system of claim 1, wherein said op-amp circuit is positioned in said electronic device.

4. The system of claim 1, wherein said processor circuit includes a microprocessor.

5. Circuitry associated with a battery pack for identifying characteristics of a battery within said battery pack, comprising:

a first set of resistors comprising at least one resistor;

a first set of capacitors comprising at least one capacitor, said first set of resistors and said first set of capacitors being organized into a circuit lattice, said circuit lattice being specifically for completing a notch filter circuit wherein an output of said notch filter circuit provides a battery information signal when electrical noise is input into said notch filter;

said notch filter circuit is completed when said battery pack is connected to an electrical apparatus.

6. The circuitry of claim 5, further comprising an analog to digital converter for receiving said battery information signal and for outputting a digital signal associated with said battery information signal.

7. The circuitry of claim 6, further comprising:

a look-up table;

a battery voltage level detector circuit; and

means for processing, connected to said look-up table, said output of said analog to digital converter and said battery voltage level detector circuit, for determining a remaining amount of battery energy.

8. The circuitry of claim 5, further comprising a noise generator for producing said electrical noise to be input into said notch filter.

9. The circuitry of claim 5, further comprising:

a plurality of capacitors; and

a plurality of resistors, said plurality of capacitors and resistors being organized into a plurality of individual circuit lattices wherein each of said plurality of circuit lattices completes a different notch filter circuit wherein the output of each said different notch filter circuit provides a portion of said battery information signal.

10. A battery type determination circuit comprising:

a resistor and capacitor network within a battery pack;

an op-amp circuit adapted to connect with said resistor and capacitor network thereby establishing a notch filter;

a noise generator connected to an input of said noise generator; and

means for determining a battery type based on an output of said notch filter.

11. The battery type determination circuit of claim 10, wherein said determining means comprises:

an analog to digital converter connected to and output of said notch filter;

a look-up table;

a processor circuit connected to an output of said analog to digital converter and to said look-up table for determining a battery type.

12. The battery type determination circuit of claim 11, wherein said processor circuit is further for determining a chemical composition of said battery.

13. The battery type determination circuit of claim 11, wherein said processor circuit is further for determining said battery'"'"'s energy capacity level.

14. The battery type determination circuit of claim 11, wherein said processor circuit is further for determining a time till said battery is discharged based on a battery'"'"'s present usage level.

15. An electronic apparatus comprising:

a removable battery pack comprising;

a battery and at least a first portion of a notch filter circuit;

a noise generator adapted to connect to said battery pack;

an analog to digital converter which connects to said battery pack when said battery pack is connected to said noise generator; and

a processor for receiving a signal from said analog to digital converter and thereby determining parameters associated with said battery in said battery pack.

16. The electronic device of claim 15, further comprising a second portion of said notch filter outside of said battery pack.

17. The electronic device of claim 15, further comprising a second portion of said notch filter within said battery pack.

18. The electronic device of claim 15, further comprising a battery charging circuit for charging said battery.

19. The electronic device of claim 15, wherein said first portion of said notch filter comprises surface-mount technology.

20. A method of determining a battery'"'"'s status comprising the steps of:

determining a battery voltage level;

determining a battery type based on an output of a notch filter associated with a battery;

looking-up a discharge curve for said battery type;

determining where on said discharge curve said determined voltage level is;

calculating the amount of time until the battery will be discharged below a predetermined voltage level based on a battery'"'"'s present usage level.

21. The method of claim 20, further comprising a step of determining a present current usage and wherein said determined current usage is used in said calculating step.

22. The method of claim 20, wherein said notch filter comprises a resistor and capacitor network incorporated into a battery pack for said battery.